Pressing vehicle wheel



Patented June 2, i936- NTTED STATES PATENT OFFICE PEEssING VEHICLE WHEEL Application August 5, 1932, Serial No. 627,669 In Germany March 10, 1932 6 Claims. (Cl. 29159.01)

The present invention relates to the production of disc or spoke wheels in which the discshaped part between the hub and the rim and the thick portion of the disc adjacent the rim are undulated in concentric section and has for its object to provide an improved method for undulating such wheels by pressure.

Disc wheels are known in which the disc-shaped part between the hub and the rim, besides having an S-shaped undulation in a radial direction, is also undulated in the axial direction or is deected alternately towards one side or the other.

In the case of cast wheel discs this double kind vof undulation of the disc in radial and in concentric section requires complicated moulds for producing these shapes, but offers no other diiiiculties. In the case of forged or pressed disc wheels, undulated in this way, the undulation in concentric section could hitherto extend ,only over the central part between the hub and the rim and over the part of the disc which increases in thickness adjacent the rim, while the depth of the undulation decreased as it came nearer the rim, and nally merged into the junction of the disc to the rim, because in the pressing method a displacement of the working material at this place was hitherto not possible by reason of the relatively small cross section of the junction. This applies more particularly to those cases in which the rim, and in some cases the hub also, are springy rings, in which, in order to obtain the spring eiect the cross sections of the junctions of the disc-shaped pieces to the hub and to the rim are kept as small as possible, and'merge 1 into the hub and the rim by rounded connections of as small a radius as possible. In consequence of these small cross sections and rounded connections a relative displacement of the junction of the disc at the rim, while the pressing operation was hitherto not possible.

According to the present invention it is now possible, in the case of disc or other Wheels consisting of forgeable material and of which the disc partis rst rolled level and then'pressed into the desired shape, to undulate the disc part .including the juncture to the rim in concentric and if desired also in radial section during the pressing, by also undulating the rim during the pressing process, said rim having been rolled suitably wider in an axial direction, or to bend it in the same operation first to one side and then to the other. The pressing of the disc part together with the rim by which those parts are undulated either in concentric section or in concentric and radial sections is effected without relative displacement in alternate direction, After the pressing, the surplus material on either side ofthe rim can be removed for example by machining.

According to the present invention, it is possible to produce the undulation of the rim in concentric section with the same depth rif-undulation as that to be produced in concentric ,section in the disc part of the wheel. The advantage of the new process consists in that the junction of the disc to the rim is not subjected at any place to a displacement in relation to the rim, so that the fibres of the working material are not displaced in an axial direction and the material being worked does not undergo any stress in this direction.

It is however also possibleto produce an undulation of the rim in concentric section of a lesser depth than that of the disc, so that the thick portion of the disc adjacent the rim is also displaced in relation to the rim. In this matter the displacing of this part can however be limited to such an extent that no undue stress of the working material in an axial direction will occur and the fibres are not subjected to undue displacement.

For carrying out the new process a die may be used which consists of two halves the surface of which is undulated in concentric and radial section. The said die halves have each a recess for the hub and an annular recess for the rim of the wheel, the latter recess also being provided with undulations in concentric section.

The seam separating the halves 'of the die can either have a level surface or be of undulating shape, so as to produce the desired undulation.

The new process is suitable particularly for producing wheel discs for vehicles running on rails, or for motor or other vehicles, and can also be used in all cases in which'it is a matter of producing rotatable bodies of forgeable material, in which the disc-shaped part between the hub and the rim, including the junction of the disc to the rim, is to be given an undulation shape in concentric section.

The invention is not limited only to the production of wheel discs undulated in the above described way but inclu-des also the production of spoked wheels, in which the spokes including their junctions to the rim are displaced rst r to one side and then to the other of the central position.

Inv the drawing the new process is illustrated by way of an example by a die for carrying out the invention` drawn on a smal-ler scale and extended in a'plane.

The wheel Vdisc is in the rst place rolled level into the shape shown by the dotted lines 3. Be-

i sides the S-shaped undulation in a radial direction, the disc is undulated in an axial direction respectively in concentric section by the two die halves I and 2, so that different radial sections of the disc take the form shown at 4 or 5. As the junction or passage of the disc to the rim has also 'an undulating shape in an axial direction respectively in concentric section, according to the present invention and in order to eliminate a displacement of this junction in relation to the rim, the rim 5a, is undulated in an axial direction respectively in concentricsection b'y giving the die surfaces 6 and 1 an undulating shape. The die surfaces themselves enclose the previously rolled cylindrical outer faces of the rim with the parts 8 and 9, whereby the separating seam I0 has also a corresponding undulated shape.r The shape of the ring-shaped parts 8 and 9 facilitates the placing of the piece to be worked into the die and its ejection after pressing. Any already known devices for ejecting Ythe pressed pieces from the die can of course be used.

VIt is-further possible, for the purpose of facilitating the ejection of the pressed pieces, to provide the previously rolled level raw' disc on its outer surface with a bulge (as shown atl I) during the rolling, which bulge remains straight or is undulated during the pressing processaccording to Whether the die surface is straight or undulated, and under, which a tool can be inserted for the purpose of facilitating the ejection. It is obvious that also so-called solid wheels, that are wheels in which the tire is integral with the rim may be produced according to the present invention.

What I- claim and desire to secure by Letters 1. The method of producing wheels undulated in concentric section which consists in rolling the wheels without undulating and with a relatively wide rim and then undulating the wheel together with the rim in concentric section without relative displacementeof them by a pressing operation and 'then removing the surplus material from the rim.y

2. The method of producing wheels undulated in concentric and radial section which consists in rolling the wheels without undulationsV and with a relatively wide rim. and then undulating in concentric and radial sections the wheel together with the rim without relative displacement of them byva pressingv operation and then removing the surplus material' from the rim.

3. The method of producing disc wheels having the disc thereof and the junction of the disc to the hub and rim undulated in concentric and radial section which consists in rolling the wheel without undulations and Witha relatively wide rim, and then undulating in concentric and radial sections the disc and its junction to the rim to- 15 gether with the rim without relative displacement by a pressing operation and finally removing the surplus material from the rim.

4. The method of producing spoke wheels `having the spokes'and their junctions to the hub and 20 rim undulated in concentric and radial section whi'ch consists in rolling the wheel without undulations rand with a relatively wide rim and then undulating in concentric and radial sections the wheels together with the rim by a pressing operation and iinally removing the surplus materiall from the rim by machining.

5. A method of producing corrugated discwheels which consists in rolling the wheels with a level disc part and a rim of greater width than in the iinal wheel, pressing the disc part together with the rim without relative displacement' in alternate axial directions to undulate both in concentric section, and then machining the lateral faces ofthe rim so that the elevations of the corrugations are removed and the width of the rim is reduced to the desired width.

6. A method lof producing corrugated discwheels which consists in rolling the wheels with 40 a level disc part and a rim of greater width than in the final wheel, pressing the disc part together with the rim without relative displacement yin alternate axial directions to undulate both in concentric and radial sections, and then ma- 45 chining the lateral faces of the rim so that the Velevations of the corrugations are removed and the width of the rim is reduced to the desired width. l y

MORITZ WINKLER. 

